﻿<blockquote class="extDef">
NOTE&nbsp; Definition according to ISO/CD 10303-41:1992<br>
A unit is a physical quantity, with a value of one, which is used as a standard in terms of which other quantities are expressed.
</blockquote>

<blockquote class="note">
NOTE&nbsp; Select item <em>IfcMonetaryUnit</em> is an addition to ISO 10303-41.
</blockquote>

<blockquote class="note">
NOTE&nbsp; Corresponding ISO 10303 name: unit, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<p>SELECT</p> 
<ul>
<li><em>IfcNamedUnit</em>: A unit which is identified by a name.</li>
<li><em>IfcDerivedUnit</em>: A unit which is derived from an expression of units.</li> 
<li><em>IfcMonetaryUnit</em>: A unit for defining currencies.</li> 
</ul>

<blockquote class="history">
HISTORY&nbsp; New type in IFC1.5.1.
</blockquote>